JPS6136079A - Differential gear for front and rear wheel driving type motor tricycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel differential device that adjusts the rotational difference between front and rear wheels and distributes torque in a vehicle such as a front- and rear-wheel drive motor tricycle for traveling on rough terrain. .

As shown in Fig. 4, the above-mentioned vehicle is a so-called full-time system that drives the steering wheel and the entire width of the rear two wheels, so it is equipped with a differential device D at the rear of the power unit P that works with the steering wheel. It is designed to correct and adjust the rotational difference between the front wheel and the rear wheel due to steering of the front wheel.

However, as shown in the figure, the differential device DF has side gears G1. Gg, in other words, the axis S1. S2
Due to the general configuration in which the axis S1. Before being connected to S2, the transmission members (1) and (2) to the rear wheels will be placed at separate positions, which may result in poor assembly and damage to the support parts (stays, brackets, etc.).・・・・・・
etc.), and furthermore, interference with other mounted auxiliary equipment may occur.In vehicles with limited space, this is not a desirable layout and an improvement is desired.

An object of the present invention is to form the shaft S1 of the side gear G1 on one side of the differential device into a cylindrical body in order to solve the problems of the prior art as described above, and to form the shaft S1 of the side gear G1 on the other side of the differential device into a cylinder.
1ii11 S 2 is passed through the inner space of this cylindrical body and passed vertically, and the two shafts are arranged facing in a certain direction, thereby becoming a power transmission member to the front and rear wheels connected thereto. Centralize power transmission chains, power transmission toothed belts, drive shafts, etc. by placing them as close as possible to each other or next to each other, thereby improving ease of assembly, ease of maintenance, space saving, etc. It is an object of the present invention to provide a differential device suitable for vehicles such as front and rear wheel drive type automatic tricycles, which can prevent interference between the front and rear wheels and auxiliary machinery.

A feature of the present invention is that a differential device is disposed horizontally at the rear end of a power unit consisting of a so-called transverse engine, a clutch, and a transmission gear group, and the differential device is mounted on one side of the vehicle body frame. Two protruding shafts are provided, and power transmission members for driving the front and rear wheels are disposed on these two shafts.

The present invention will now be described in detail with reference to an embodiment shown in the accompanying drawings.

Fig. 1 is an overall side view of a front and rear wheel drive type automatic tricycle for traveling on rough terrain (hereinafter referred to as the auto three-wheeled buggy vehicle) which is a variation of the present invention, Fig. 2 is a front view, and Fig. 3 is a diagram of the present invention. FIG. 2 is an explanatory schematic plan view showing a differential device and a power transmission system to front and rear wheels.

The three-wheeled buggy vehicle 1 shown in FIG. 1 has a main frame 4 equipped with a fuel tank 3 connected to the rear of a head pipe 2 at the front end, and a down tube 5 extending downward and raised at the rear and connected to a rear frame 10. , a center frame 8 that vertically connects a bottom frame 6, a rear down tube 7, and the center of the vehicle body, and the rear frame 10 that extends rearward from the rear end of the main frame 4, and as shown in the figure, it has a loop shape when viewed from the side. A power unit P containing a differential gear DF, which will be described in detail later, is mounted inside the formed vehicle body. The two rear wheels wr and wr2 are rotatably supported at the rear end of a swingable rear fork 22 via a driven shaft 25.

On the other hand, the front fork Ff is of the so-called rigid type, and is swingable within the head pipe, and consists of a pair of left and right legs 11 and 11' as shown in Fig. 2, and the lower end of this is connected to an axle 12 for steering. One front wheel Wf is supported.

In the figure, 13 and 14 indicate upper and lower brackets that support the above-mentioned front fork Ff.

A front wheel drive device 15 is installed across the leg portions 11 and 11' so as to straddle the upper part of the front wheel Wf, and between the lateral drive shaft 16 disposed in the direction of the vehicle 11 and the front wheel Wf. An endless transmission member 17 such as a transmission chain or a toothed belt is suspended via sprockets 41 and 42, and a constant velocity ball joint is installed at both ends between the front wheel drive device 15 and the transfer unit 18 on the vehicle body side. A pair of bevel gears G! are rotatably connected by a drive shaft 21 having inlets 19 and 20. 1. Torque is transmitted to the lateral drive shaft 16 by G6.

Power unit l-P is located at the front (left side in the figure) as shown in Figure 3.
It has the crankshaft 26 of the engine E, and the transmission shafts and the gear group CG are connected to the rear, and furthermore, a differential gear DF is disposed horizontally at the rear end. The differential device DF transmits power from the gear group GG through the outer gear 28 of the differential case 27, and inside the differential case 27 there are a pair of left and right gears centered around a pinion gear 29 that is rotatable in the front and back direction. Side gears G+ and G2 are meshed and connected.

The shaft 30, which is integrated with or connected to the side gear G1, is formed into a hollow cylindrical body (tubular shape).

On the other hand, the shaft 31 of the side gear G2 is provided to protrude toward the side gear G+, the shaft 31 is inserted through the hollow portion of the shaft 30, and the tip thereof is projected outside from the end portion of the shaft 30.

As a result of the above, the axes 30 and 31 are on the same rotation axis center,
Moreover, they are arranged facing in the same direction, which makes it an extremely suitable device for transmitting power to the front and rear wheels of vehicles such as motorcycles and tricycles, as will be explained in detail below.

That is, toothed pulleys 32 and 33, which are power transmission members, are fixed to the protruding shaft ends of the shafts 30 and 31 by spline fitting, respectively, and the toothed pulleys 32 and the rear two shafts wr1' and wr2 are connected to each other.
The toothed belt 35 for driving the rear two wheels is suspended between the toothed pulley 34 on the side driven shaft 25, and the toothed belt 35 for driving the rear two wheels is suspended between the toothed pulley 33 and the driven shaft protruding from the side of the upper transfer unit 18. Similarly, a toothed belt 38 for driving the front wheels is suspended and connected between the driven toothed pulley 37 on the shaft 36. Sho G3. G4 indicates a power transmission bevel gear in the transfer unit.

Thus, at the rear of the power unit (P), the toothed pulleys 32, 33 and the toothed belts 35, 38 are protruded from one side of the vehicle body and are closely arranged in a concentrated manner. In addition, instead of the toothed belt 35°38 in the example, this may be used as a variety of chains, or a so-called shaft drive system using a bevel gear and a transmission shaft may be used. can be selected.

In -L, as the front wheel Wf turns, the rear two wheels wr
, or the difference in rotation due to the difference in the turning radius with wr2 is effectively and effectively absorbed and adjusted by the differential device DF, and the front wheel Wf and the rear two wheels Wrl and Wl-2 are adjusted to the optimum speed according to the steering angle. The number of revolutions is distributed, which prevents braking during turns and enables smooth turning.

Furthermore, as shown by the chain line in Fig. 3, the shaft 30 and the other side gear G
If a clutch mechanism 40 is interposed in the clutch mechanism 2 and locked to form a so-called limited slip differential mechanism, it will be particularly advantageous for running on gravel or muddy areas.

As explained above, according to the present invention, one shaft of the differential device, which is a main part of a rear-wheel drive automatic tricycle, is made hollow, and the shaft on the other side is passed through the inside of the differential device before full time, and the shaft on the other side is passed through the inside of the differential device. Since the two shafts are designed to protrude in the same direction, the two shafts are in the same direction and have the same axis center.This allows the power transmission members to the front and rear wheels to be set close to each other. , it can be advantageous and excellent in terms of ease of assembly, ease of maintenance, and furthermore, appearance design.

Furthermore, by centralizing the transmission members, interference with other auxiliary equipment is also prevented, and the degree of freedom in mounting them can be improved.

Of course, this differential device can also be freely used in other motorcycles, tricycles, and other vehicles with the same layout.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG.
The figure is a front view of FIG. 1, and FIG. 3 is an explanatory schematic plan view showing a differential gear and a power transmission system connected thereto to the front and rear wheels. In addition, in the drawing, 2 is the head pipe, 8 is the center frame,
15 is a front wheel drive device, 18 is a transfer unit,
19 and 20 are constant velocity ball joints, 27 is a differential case, 32 and 33 are toothed pulleys, and 35 and 38 are toothed belts.

Claims (1)

[Claims] In a full-time automatic three-wheeled vehicle comprising one steering front wheel and two rear wheels, the front and rear wheels being connected to a differential device on the power unit side, of a pair of side gears and a shaft that constitute the differential device, One shaft is formed into a hollow, cylindrical shape, and the shaft of the other side gear passes through the hollow part of the shaft and projects to the outside, and power transmission members to the front and rear wheels are connected to the two shafts. A differential device for front and rear wheel drive automatic tricycles that is characterized by: